die Laufbahn
career
A person's professional or career-related path and development.
Sie schlug eine akademische Laufbahn ein und wurde Professorin.
She pursued an academic career and became a professor.

career / track / orbit
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career
A person's professional or career-related path and development.
Sie schlug eine akademische Laufbahn ein und wurde Professorin.
She pursued an academic career and became a professor.

'Laufbahn' is made up of 'Lauf' (from laufen, to run) and 'Bahn' (way, path). The meaning changes depending on what is moving along this 'Bahn' (path): a person's career, an athlete, or a celestial body.
Seine berufliche Laufbahn führte ihn durch viele Länder.
His professional career took him through many countries.
The context reveals which meaning is intended. Words like 'Beruf' (profession) or 'Karriere' (career) point to professional development. 'Stadion' (stadium) or 'Rennen' (race) point to the sports track. 'Planet' or 'Komet' (comet) signal the astronomical meaning.
Er möchte nach der Schule eine Laufbahn als Polizist einschlagen.
After school, he wants to pursue a career as a police officer.
In the sense of 'Karriere' (career), 'Laufbahn' is often used with the verb 'einschlagen' (to pursue / embark on). Typical adjectives are 'akademisch' (academic), 'politisch' (political), or 'beruflich' (professional).
Nach dem Studium schlug sie eine akademische Laufbahn ein.
After her studies, she pursued an academic career.
When referring to the running track in a stadium, the preposition 'auf' is almost always used. You run 'auf der Laufbahn' (on the track).
Die Athleten wärmen sich auf der Laufbahn für das Rennen auf.
The athletes are warming up on the track for the race.
train / track
'die Bahn' and 'die Laufbahn' can both mean a fixed path or track for movement. In sports, 'die Laufbahn' specifically means the track that people run on, usually in a stadium. 'die Bahn' is more general and can also mean a swimming lane, a bowling lane, or the trajectory of an object. For celestial bodies or projectiles, both can refer to a path of movement, but 'Laufbahn' sounds more specific here. Learners may confuse them because 'Laufbahn' contains the word 'Bahn'. The important point is: every 'Laufbahn' is a kind of 'Bahn', but not every 'Bahn' is a 'Laufbahn'.

Vor dem Wettkampf wärmen sich die Läufer auf der Laufbahn auf.
Before the competition, the runners warm up on the track.
Beim Kegeln rollte die Kugel langsam über die Bahn.
During bowling, the ball rolled slowly down the lane.